CN100564550C - The high tensile steel plate that unit elongation and reaming are good or the producing apparatus of hot dip galvanized high strength steel sheet - Google Patents

The high tensile steel plate that unit elongation and reaming are good or the producing apparatus of hot dip galvanized high strength steel sheet Download PDF

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CN100564550C
CN100564550C CNB2005800395062A CN200580039506A CN100564550C CN 100564550 C CN100564550 C CN 100564550C CN B2005800395062 A CNB2005800395062 A CN B2005800395062A CN 200580039506 A CN200580039506 A CN 200580039506A CN 100564550 C CN100564550 C CN 100564550C
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tempering
steel plate
equipment
reaming
dip galvanized
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CN101061241A (en
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谷口裕一
野中俊树
村山弘树
簗场康司
加藤敏
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Nippon Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching

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Abstract

The invention provides the producing apparatus of good high tensile steel plate of a kind of unit elongation and reaming or hot dip galvanized high strength steel sheet, it is by making continuous processing apparatus with quenching apparatus and tempering equipment, because tempering improves material, not only make the reaming raising, unit elongation also can improve, and can make high tensile steel plate or hot dip galvanized high strength steel sheet.It is characterized in that: in continuous annealing apparatus, continuous hot-dipping galvanizing treatment facility or their dual-purpose equipment or with they the following equipment of configuration continuously and with establishing: after can be with recrystallize or behind the recrystallize and the steel plate after the galvanizing processing be cooled to the quenching apparatus of the humidity province below the martensitic phase height; This steel plate is carried out the tempering equipment of tempering, insulation; And this steel plate is cooled to cooling apparatus again below 100 ℃.

Description

The high tensile steel plate that unit elongation and reaming are good or the producing apparatus of hot dip galvanized high strength steel sheet
Technical field
The present invention relates to make the good high tensile steel plate of unit elongation and reaming or the equipment of hot dip galvanized high strength steel sheet.
Background technology
In recent years, further require the fuel efficiency of automobile to improve and the car body lightweight, in order to realize lightweight, to the demand raising of high tensile steel plate.But intensity improves more, and plasticity is difficult more, and particularly the unit elongation of steel reduces.And according to different members, expansion machining hole portion is quite a few with the parts that make its flange that forms bead processing, and therefore also beginning requirement possesses reaming in the lump as important characteristic.
In order to satisfy this requirement, opening flat 2001-192768 communique, spy according to the spy opens flat 2001-200338 communique, spy and opens flat 2001-3150 communique, spy and open flat 2001-207235 communique, spy and open that flat 2001-207236 communique, spy are opened flat 2002-38248 communique, the spy opens flat 2002-309334 communique and the spy opens flat 2002-302734 communique, proposed technology, utilized TRIP steel and complex tissue steel plate to attempt to improve the scheme of reaming by the tempered martensite of applying in a flexible way, 2 tempering heat treatment of enforcement.
Like this, having required the high tensile steel plate of reaming and having carried out the steel plate that galvanizing handles just constantly increases, and on the other hand, also require not carry out the high high tensile steel plate of reaming that galvanizing is handled, in addition, also require normally to produce the high steel plate of deep drawn that uses in the more soft steel plate that uses in the past the automobile cover plate panel or the food tray etc.
For stable and produce these diversified steel plates expeditiously, begin to utilize a series of equipment chain can carry out continuously the continuous annealing hot-dip galvanizing device of hot dip process processing at the continuous annealing apparatus that steel plate is carried out the continuous annealing processing of traditional single purpose type and from annealing, must make up these a plurality of equipment and lead to plate, the problem of generation is: the additional construction of equipment or the prolongation of manufacturing schedule and the increase of production cost.
Summary of the invention
The object of the present invention is to provide a kind of equipment, can all make good high tensile steel plate of unit elongation and reaming or hot dip galvanized high strength steel sheet aspect cost, duration efficiently.
Present inventors have studied the good high tensile steel plate of unit elongation and reaming or the equipment of hot dip galvanized high strength steel sheet made, found that, in continuous annealing apparatus, galvanizing treatment facility or dual-purpose equipment at them or with its continuously and configuration " can make finish the annealed steel plate be cooled to the quenching apparatus of the humidity province below the martensitic phase height and this steel plate is carried out the tempering equipment that tempering is incubated " with establishing, this is for controlling the tempered martensite amount arbitrarily, guaranteeing, improve unit elongation and reaming is extremely important.
Promptly, verify in the present invention, with quenching apparatus and tempering equipment between different production lines, quenching～tempering, once be cooled to the situation of normal temperature different, by forming a series of continuous processing apparatus, can at random control quenching/tempering temperature, can at random control guaranteeing and improving tempered martensite amount and the tensile strength that unit elongation and hole expansibility play great role.
Main idea of the present invention is as follows.
(1) the good high tensile steel plate of a kind of unit elongation and reaming or the producing apparatus of hot dip galvanized high strength steel sheet is characterized in that: dispose following equipment continuously and in continuous annealing apparatus, continuous hot-dipping galvanizing treatment facility or their dual-purpose equipment or with them with establishing: after can be with recrystallize or behind the recrystallize and the steel plate behind the galvanizing be cooled to the quenching apparatus of the humidity province below the martensitic phase height; This steel plate is carried out the tempering equipment of tempering, insulation; And this steel plate is cooled to cooling apparatus again below 100 ℃.
(2) according to the good composite high strength steel plate of (1) described unit elongation and reaming or the producing apparatus of hot dip galvanized high strength steel sheet, it is characterized in that: the tempering intensification amount Δ T between above-mentioned quenching apparatus and the above-mentioned tempering equipment falls into the scope of the following formula (A) of being tried to achieve by the tensile strength TS after the tempering and hole expansibility λ; Temperature T before the tempering (℃) fall into the scope of the following formula (B) of trying to achieve by the tensile strength TS after the tempering and hole expansibility λ.
0.028(λ-28)TS-11.5λ-40≤ΔT≤0.028(λ-28)TS-7.5λ-90
(A)
[{-2(λ-40) 2}/10 5]×(TS-580) 2-8λ+700≤T≤[{-15(λ-45)}/10 5]×(TS-580) 2-λ+555 (B)
λ: hole expansibility (%); TS: the tensile strength after the tempering (MPa);
T: temperature T before the tempering (℃); Δ T: tempering intensification amount (℃)
(3) according to the good high tensile steel plate of (1) or (2) described unit elongation and reaming or the producing apparatus of hot dip galvanized high strength steel sheet, it is characterized in that: the type of cooling of quenching apparatus is any in air water cooling, spray cooling, water spray cooling, the immersion cooling.
(4) according to the good high tensile steel plate of (1), (2) or (3) described unit elongation and reaming or the producing apparatus of hot dip galvanized high strength steel sheet, it is characterized in that: the type of heating of tempering equipment is an induction heating.
Description of drawings
Fig. 1 is the explanatory view of the producing apparatus of good high tensile steel plate of expression unit elongation of the present invention and reaming or hot dip galvanized high strength steel sheet.
Fig. 2 is the explanatory view of the relation of temperature and TS before the tempering of the final reaming value of expression when being 45% level.
Fig. 3 is the explanatory view of the relation of temperature and TS before the tempering of the final reaming value of expression when being 55% level.
Fig. 4 is the explanatory view of the relation of temperature and TS before the tempering of the final reaming value of expression when being 65% level.
Fig. 5 is the explanatory view of the relation of the unit elongation of expression the present invention and traditional method and hole expansibility.
Embodiment
Below, according to embodiment the good high tensile steel plate of unit elongation of the present invention and reaming or the equipment of hot dip galvanized high strength steel sheet made is described.
Embodiment
Fig. 1 is the sketch chart of expression one embodiment of the invention, expression is as making the good high tensile steel plate of unit elongation and reaming or the equipment of hot dip galvanized high strength steel sheet, can be used for cold-rolled steel sheet or hot-rolled steel sheet annealing, with the notion of the producing apparatus of the manufacturing of hot dip galvanized high strength steel sheet.
As shown in Figure 1, the producing apparatus of high tensile steel plate of the present invention or galvanizing, configuration annealing heating installation 1, annealing cooling apparatus 2, heat-preserving equipment 3, galvanizing treatment facility 4, alloying equipment 5, quenching apparatus 6, tempering equipment 7 and cooling apparatus 8 successively again.In Fig. 1, solid arrow is represented hot-dip galvanized steel sheet logical board assembly line during fabrication, dotted arrow is represented cold-rolled steel sheet or the logical board assembly line of hot-rolled steel sheet when annealing, and the galvanizing treatment facility is walked around in expression, turns back to original logical board assembly line before alloying equipment or quenching apparatus.
(embodiment 1) is under the situation of making hot rolling and cold rolling high strength steel plate
For hot rolling or cold-rolled steel sheet, especially under the situation of making the good high tensile steel plate of unit elongation and reaming, with hot rolling or the cold-rolled steel sheet that for example contains C:0.01～0.3%, Si:0.005～2%, Mn:0.1～3.3%, P:0.001～0.06%, S:0.001～0.01%, Al:0.01～1.8%, N:0.0005～0.01% and form by surplus Fe and unavoidable impurities in quality %, annealing heating installation 1 in Ac 1～Ac 3Heating is 30 seconds～30 minutes under+100 ℃ the temperature, then is cooled to 450～600 ℃ temperature with the 1 ℃/speed of cooling more than the s in annealing cooling apparatus 2.Secondly, as requested, after keeping 10 seconds～30 minutes under 150～500 ℃ the temperature, under the situation of Fig. 1 " no plated via ", pass course a walks around galvanizing treatment facility 4, then passes alloying equipment 5 as route b in heat-preserving equipment 3.In addition, can also as route c, also walk around and comprise alloying equipment.Then, after in quenching apparatus 6, being cooled to temperature province below the martensitic phase height with 1 ℃/ speed of cooling more than the s, in tempering equipment 7, be warmed up to 200 ℃～500 ℃ temperature, keep 1s～5 minute, in cooling apparatus 8 again, be cooled to below 100 ℃ with 5 ℃/ cooling rate more than the s.In addition, mentioned component scope and temperature condition etc. are preferred range, are not particularly limited in this.
Quenching behind the situation/galvanizing of (embodiment 2) manufacturing hot dip galvanized high strength steel sheet, tempering
For hot rolling or cold rolling hot dip galvanized high strength steel sheet, especially under the situation of making the good hot dip galvanized high strength steel sheet of unit elongation and reaming, with the plating raw sheet that for example contains C:0.01～0.3%, Si:0.005～2%, Mn:0.1～3.3%, P:0.001～0.06%, S:0.001～0.01%, Al:0.01～1.8%, N:0.0005～0.01% and form by surplus Fe and unavoidable impurities in quality %, annealing heating installation 1 in Ac 1～Ac 3Heating is 30 seconds～30 minutes under+100 ℃ the temperature, then is cooled to 450～600 ℃ temperature with the 1 ℃/speed of cooling more than the s in annealing cooling apparatus 2.Secondly, as requested, in heat-preserving equipment 3, after keeping 10 seconds～30 minutes under 150～500 ℃ the temperature,, make steel plate pass through galvanizing treatment facility 4, impose the galvanizing of the weight per unit area of regulation by " plated via is arranged " of Fig. 1.And as requested, in alloying equipment 5, impose Alloying Treatment.Then, after in quenching apparatus 6, being cooled to temperature province below the martensitic phase height with 1 ℃/ speed of cooling more than the s, in tempering equipment 7, be warmed up to 200 ℃～500 ℃ temperature, keep 1s～5 minute, in cooling apparatus 8 again, be cooled to below 100 ℃ with 5 ℃/ cooling rate more than the s.In addition, mentioned component scope and temperature condition etc. are preferred range, are not particularly limited in this.
(embodiment 3) make the preceding quenching of situation/galvanizing, the tempering of hot dip galvanized high strength steel sheet
For hot rolling or cold rolling hot dip galvanized high strength steel sheet, especially under the situation of making the good hot dip galvanized high strength steel sheet of unit elongation and reaming, with the plating raw sheet that for example contains C:0.01～0.3%, Si:0.005～2%, Mn:0.1～3.3%, P:0.001～0.06%, S:0.001～0.01%, Al:0.01～1.8%, N:0.0005～0.01% and form by surplus Fe and unavoidable impurities in quality %, annealing heating installation 1 in Ac 1～Ac 3Heating is 30 seconds～30 minutes under+100 ℃ the temperature, then will anneal cooling apparatus 2 as using with the same quenching apparatus of the quenching apparatus 6 of embodiment 2, after being cooled to the following temperature province of martensitic phase height with the above speed of cooling of 1 ℃/s, with heat-preserving equipment 3 as using with the same tempering equipment of the tempering equipment 7 of embodiment 2, be warmed up to 200 ℃～500 ℃ temperature, keep 1s～5 minute.Secondly,, make steel plate pass through galvanizing treatment facility 4, impose the galvanizing of the weight per unit area of regulation, in alloying equipment 5, impose Alloying Treatment as requested by " plated via is arranged " of Fig. 1.Then, at quenching apparatus 6 or be cooled to below 100 ℃ with 5 ℃/ cooling rate more than the s in the cooling apparatus 8 again.In quenching apparatus 6, be cooled at the tempering equipment 7 empty steel plates of crossing, not heat under the situation below 100 ℃ with 5 ℃/ cooling rate more than the s.In cooling apparatus 8 again, be cooled under the situation below 100 ℃ with 5 ℃/ cooling rate more than the s, cross steel plate in quenching apparatus 6 and tempering equipment 7 hollows and do not heat or cool off, perhaps do not do positive cooling or do not heat and rest on degree of insulation etc., in time distinguish use according to the making situation of galvanizing layer.In addition, mentioned component scope and temperature condition etc. are preferred range, are not particularly limited in this.
As embodiment 1～3, quenching/tempering equipment preferably in continuous annealing apparatus or continuous hot-dipping galvanizing treatment facility or dual-purpose equipment, be configured at them or with they continuously and establish and dispose.And, as preferably configuration again, under the situation of continuous annealing apparatus, be preferably to be connected and dispose quenching/tempering equipment with the outlet side of the outlet side of the cooling apparatus 2 of annealing or heat-preserving equipment 3; Under the situation of continuous hot-dipping galvanizing treatment facility, be preferably and be connected configuration quenching/tempering equipment with galvanizing treatment facility 4 or Alloying Treatment equipment 5.Under the situation of the dual-purpose equipment of continuous annealing apparatus and continuous hot-dipping galvanizing treatment facility, can adopt the configuration of the quenching/tempering equipment under the independent situation respectively or also can make up employing.Under the situation of dual-purpose equipment, be preferably formed configuration into the such quenching/tempering equipment of Fig. 1, because can select, have or not respectively the quenching/temper before and after plating and the plating, equipment cost is also low.
The configuration of quenching/tempering equipment be preferably in continuous annealing apparatus or galvanizing treatment facility or their dual-purpose equipment configuration or with they continuously and the reason of configuration with establishing be: the present inventor finds when investigating the concerning of tempered condition and hole expansibility, there are the such relation in Fig. 2～4 in tensile strength and hole expansibility before the tempering after temperature, tempering intensification amount, the tempering.
So, when being put in order, their relation finds, when tensile strength before tempering after temperature, tempering intensification amount, the tempering and hole expansibility satisfy formula (A) and formula (B), can guarantee necessary tempered martensite, also can guarantee good plasticity and reaming.
0.028(λ-28)TS-11.5λ-40≤ΔT≤0.028(λ-28)TS-7.5λ-90 (A)
[{-2(λ-40) 2}/10 5]×(TS-580) 2-8λ+700≤T≤[{-15(λ-45)}/10 5]×(TS-580) 2-λ+555 (B)
λ: hole expansibility (%); TS: the tensile strength after the tempering (MPa); T: temperature T before the tempering (℃); Δ T: tempering intensification amount (℃).
If fall into the scope of above-mentioned formula (A) and formula (B), perhaps in scope, control as requested, can access the good high tensile steel plate and the hot dip galvanized high strength steel sheet of the balance with tensile strength and hole expansibility of the requirement that meets the user.
In addition, about above-mentioned hole expansibility λ, be with 150mm quadrate test film with punching directly be that φ 10mm, gap are 12%, drift angle is that 60 ° circular cone drift carries out punching, and becomes the direction diffusion in the outside at the burr that make the hole, form with the forming speed of 0.5mm/sec.
The amount of the tempered martensite of the high tensile steel plate that obtains according to the present invention, when counting 0.5～60% scope with area occupation ratio, the characteristic aspect is preferred.The evaluation method of tempered martensite is: adopt the observation of opticmicroscope and martensite is observed by the LePera corrosion; Quantification adopts the LePera corrosion; To test portion grind (aluminum oxide correct grinding), dipping is implemented regrinding after 10 seconds in corrosive fluid (pure water, Sodium Pyrosulfite, ethanol, picric mixed solution), the washing back makes the test portion drying with cold wind.For the tissue of dried test portion, amplify 1000 times, area is measured with the Luzex device in the zone of 100 μ m * 100 μ m, measure the area of tempered martensite.In addition,, JIS5 tension test sheet is implemented in the tension test of rolling direction and vertical direction, is estimated about tensile strength and unit elongation.
Specification about the quenching apparatus in this case, owing to need be chilled to the following degree of martensitic phase height, so be preferably air water cooling, spray cooling, water spray cooling, immersion cooling, if but air cooling can obtain and equal above speed of cooling is cooled off in air water cooling, spray cooling, water spray cooling, immersion, and is then also no problem in the use.
In addition, specification about the tempering equipment in this case, for the densification of equipment or obtain reliable tempering effect at short notice, type of heating is preferably induction heating, if but can obtain when adopting gas burner, radiator tube process furnace and electrical heater to carry out tempering and the densification of induction heating equal extent, tempering effect in the short period of time, then no problem.
The type of cooling for the cooling apparatus again of this case does not have special stipulation, but when considering unnecessary oxidation, the variable color of zinc plating, is preferably gas cooling.
In the continuous annealing apparatus that is provided with quenching/tempering equipment or galvanizing treatment facility or their dual-purpose equipment of this case, also can possess the pre-plating equipment that plating sticking power is improved.And,, also can various finishing apparatuss be set at the outlet side of continuous annealing apparatus or galvanizing treatment facility or their dual-purpose equipment for oilness, erosion resistance and the chemical convertibility of additional surface.
Secondly, unit elongation and the reaming of just using equipment of the present invention to help high tensile steel plate are narrated.
Table 1
Composition Quality %
C 0.093
Si 0.055
Mn 1.840
P 0.007
S 0.006
Al 0.500
N 0.007
Ti
Nb 0.010
Mo 0.280
B
For example, adopt the vacuum melting furnace manufacturing to have the steel that the one-tenth shown in the table 1 is grouped into, be heated to 1200～1240 ℃ after the cooled and solidified once more, under 880～920 ℃, carry out finish rolling (thickness of slab is 2.3mm), the cooling back kept 1 hour down at 600 ℃, thereby the simulation hot rolled batches thermal treatment.By the hot-rolled sheet that obtains is carried out grinding, scale removal imposes 7 cold rolling (1.2mm), uses the continuous annealing analog machine then, carries out the annealing of 750～880 ℃ * 75s, implements galvanizing down at 490 ℃, carries out Alloying Treatment under 510 ℃.Then, make respectively, confirmed the effect of equipment of the present invention with the condition of table 2.
[1]～[3] be example in the past as a comparative example, [1] expression is only quenched and is not had the tempered situation; [2] and [3] be illustrated in logical plate in the past the continuous hot-dipping galvanizing treatment facility, and be cooled to normal temperature (quenchings) afterwards in carrying out on the other production line under the tempered situation; [4]～[7] under the situation that expression employing equipment of the present invention is handled.
Figure C20058003950600131
From as can be known above-mentioned, according to equipment of the present invention, material is improved by tempering, not only make the reaming raising, can also control quenching/tempering temperature condition arbitrarily, can obtain thus comprising that the material of the wide region that improves unit elongation improves effect.
According to the present invention, a kind of equipment can be provided, can aspect cost, duration, all make efficiently use in the trolley part etc., unit elongation and good high tensile steel plate or the hot dip galvanized high strength steel sheet of reaming, high in industrial value.

Claims (5)

1. the good high tensile steel plate of unit elongation and reaming or the producing apparatus of hot dip galvanized high strength steel sheet is characterized in that: dispose following equipment continuously and in continuous annealing apparatus, continuous hot-dipping galvanizing treatment facility or their dual-purpose equipment or with them with establishing: after can be with recrystallize or behind the recrystallize and the steel plate behind the galvanizing be cooled to the quenching apparatus of the humidity province below the martensitic phase height; This steel plate is carried out the tempering equipment of tempering, insulation; And this steel plate is cooled to cooling apparatus again below 100 ℃.
2. the high tensile steel plate that unit elongation according to claim 1 and reaming are good or the producing apparatus of hot dip galvanized high strength steel sheet is characterized in that: the tempering intensification amount Δ T between described quenching apparatus and the described tempering equipment falls into by the tensile strength TS after the tempering and hole expansibility λ and the scope of the following formula (A) of trying to achieve; Temperature T falls into the scope of the following formula (B) of being tried to achieve by the tensile strength TS after the tempering and hole expansibility λ before the tempering;
0.028(λ-28)TS-11.5λ-40≤ΔT≤0.028(λ-28)TS-7.5λ-90
(A)
[{-2(λ-40) 2}/10 5]×(TS-580) 2-8λ+700≤T≤[{-15(λ-45)}/10 5]×(TS-580) 2-λ+555 (B)
λ: hole expansibility, unit is %; TS: the tensile strength after the tempering, unit is MPa;
T: temperature T before the tempering, unit is ℃; Δ T: tempering intensification amount, unit is ℃.
3. the high tensile steel plate that unit elongation according to claim 1 and 2 and reaming are good or the producing apparatus of hot dip galvanized high strength steel sheet is characterized in that: the type of cooling of quenching apparatus is any in air water cooling, spray cooling, water spray cooling, the immersion cooling.
4. the high tensile steel plate that unit elongation according to claim 1 and 2 and reaming are good or the producing apparatus of hot dip galvanized high strength steel sheet is characterized in that: the type of heating of tempering equipment is an induction heating.
5. the high tensile steel plate that unit elongation according to claim 3 and reaming are good or the producing apparatus of hot dip galvanized high strength steel sheet is characterized in that: the type of heating of tempering equipment is an induction heating.
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